Clay Minerals as a Feasible Additive to Stabilize Cadmium in Contaminated Soils
The adsorption behavior of clay minerals in cadmium contaminated soils has been studied in order to remedy soils contaminated with this metal in this work. The results show that Langmuir model best describes the adsorption of Cd2+, and the maximum sorption values of 8.45 mg/g for bentonite, 5.69mg/g for sepiolite and 10.57mg/g for attapulgite are obtained at pH 5-6. In addition, the effect of clay minerals amendment on a highly cadmium contaminated soil has been studied by means of pot experiments. The results indicate that the metal concentrations in shoot and root of plant decreased with addition of clay minerals to soil (1%), and the highest decrease value of metal concentrations is obtained in the soils added by attapulgite amendment.
Wei Pan and Jianghong Gong
Z. Q. Hu et al., "Clay Minerals as a Feasible Additive to Stabilize Cadmium in Contaminated Soils", Key Engineering Materials, Vols. 336-338, pp. 1906-1909, 2007